NONDESTRUCTIVE METHOD AND DEVICE FOR INVESTIGATING UNDERGROUND AIR, NONDESTRUCTIVE METHOD FOR CONTROLLING CONTAMINATION OF SOIL, AND PRESSURE PARTITION USED FOR THE CONTROL

摘要

A method of investigating underground air, comprising the steps of installing a pressure partition (1) having openings (4) and (5) so that the openings (4) and (5) face a ground surface (G), sampling the underground air into the pressure partition (1) by reducing a pressure in the pressure partition (1) to a negative pressure, and investigating the sampled air, wherein the pressure partition (1) is formed in an at least double structure comprising an outside pressure partition (2) and an inside pressure partition (3) and, since the underground air (20) flowing into an outside space (7) between the outside pressure partition (2) and the inside pressure partition (3) is mixed with the atmospheric air (23), the mixed air is released to the outside, and only the underground air (21) flowing into an inside space (8) on the inside of the inside pressure partition (3) is sampled and investigated.